WASTE PAPER CAN BE USED AGAIN AFTER BEING ... .A. PRODUCEDB. RECYC...

49. - 3500 CAU TRAC NGHIEM ON TAP AV THCS
3500 CAU TRAC NGHIEM ON TAP AV THCS

49. Waste paper can be used again after being ... .

a. produced

b. recycled

c. wasted

d. preserved

 b